EDFA-B-C 17dBm User manual
Contents
1. Direction LOP LASER Brown _ 38 Par4 47 55 Green Blue 85 Pair 3 Pair 1 T Orange 7 Pair 2 Figure 3 GPI Outlet nevion com 9 EDFA B C 17dBm 4 4 RS232 control Rev D If dip switch 7 A_M is set OFF Manual the GYDA dip switch control over the EDFA will halt and the RS232 input will be enabled RS232 output is always on Bitrate 9600 8N1 8 databits no parity 1 stop bit A typical prompt will be MSA EDFA gt When the prompt returns the module is ready for a new command There is an option to set the bitrate of the EDFA module to something else than 9600 but this will disable autonomous GYDA operation until reset back to 9600 The following table lists the most useful commands the HELP command will list all commands Command Example response Comment GET_STATUS MODULE DISABLED DI CONTROL AGC ALARMS NORMAL LD NORMAL GET_INFO GET_BAUD Bit rate of serial port SET_BAUD 4800 9600 OK 14400 19200 38400 GET_ECHO SET_ECHO ON OFF OK Echoes characters back to the terminal Off by default GET_MODE MODE G 18 80 dB SET_MODE P G C M lt value gt OK Power in dBm Gain in dB Current in mA or M MISSING GET_LD_POW Laser diode power measurement GET_MPD 1 2 ALL MPD1 1 82 dBm 6 58E 01 mW MPD2 8 29 dBm 1 48E 01 mW 1 input 2 output GET_LD_CRNT2. Laser diode bias current measurement GET_ALARM_LD_CRNT Alarm limit for laser diode bias current SET_ALARM_LD_CRNT lt value D gt GET_LD_TEC Laser diode thermal stabiliser current GET_TPUMP TPUMP 25 47 C GET_ALARM_TPUMP_HI ALARM_TPUMP_HI 30 00 C SET_ALARM_TPUMP_HI lt value D gt OK GET_ALARM_TPUMP_LO ALARM_TPUMP_LO 20 00 C SET_ALARM_TPUMP_LO lt value D gt OK GET_TCASE TCASE 31 03 C Ambient temperature GET_ALARM_TCASE_HI ALARM_ TCASE_HI 70 00 C Upper alarm limit SET_ALARM_TCASE_HI lt value D gt OK GET_ALARM_TCASE_LO ALARM_ TCASE_LO 0 00 C SET_ALARM_TCASE_LO lt value D gt OK GET_LOS_SWD SET_LOS_SWD ON OFF CP GET_LOS Threshold for loss of signal Input power below this triggers muting of output power SET_LOS lt value gt HELP The complete list of commands nevion com 10 EDFA B C 17dBm Rev D 4 5 Lid operated switches If the lid covering the fiber connectors on the backplane should be opened the EDFA will automatically disable This is done both by a switch in direct contact with the lid and by software through the use of an optical sensor 4 6 Key switch The key switch in the front of EDFA B C 17dBm can be used to disable the EDFA The key can only be removed when the switch is in the OFF position nevion com 11 EDFA B C 17dBm R
3. ea In le lei 7 4 1 3 Constant gain MOG ii a 7 RS A ze 8 4 2 LED Stalus dESseriplion tea nee 8 AO GAP VE ER EE A eect NRERILEIEENN PEE TEE 9 4A FA S282 CONAN 10 4 5 Lid operated Switches viii 11 4 6 Kay Wii a as 11 5 Connections A 12 B OREHAlDN re 13 6 1 Introduction es een 13 62 EDEA HEO east es 13 6 3 Operation MODES tara kg 13 General environmental requirements for Nevion equipment 44444442 gt 15 PFOQUELWartanyarsasae ha a a ee 16 Appendix A Materials declaration and recycling information 17 Axl Materials declaratione nieis eitean is 17 A 2 Recycling OMAN an 17 nevion com 3 EDFA B C 17dBm Rev D 1 Product overview The Flashlink EDFA B C 17dBm is an erbium doped fiber amplifier with a special control circuit making it better for SDI signals than normal EDFAs It is a 17dBm booster that is typically used at the beginning or in the middle of a link At the receiving end of a link a low power low noise preamp would typically be needed instead The EDFA is unidirectional by nature but can amplify up to 40 DWDM channels on a single fiber at 100GHz spacing Ideal gain flatness is achieved with input power close to the nominal input power Various safety measures are implemented like automatic shutdown if rear lid is opened to access the fiber connectors or manual shutdown by the use of GPI GYDA RS422 or turning the safety key to the off position There is also a red
4. 8C 6 2 EDFA theory Understanding the way the erbium doped fiber amplifier works can lead to easier handling of problems that occur such as wideband noise signal dependent noise bit errors under certain signal conditions etc The pump laser at 1480nm 980nm would be used for a low noise preamp with low output power and a short piece of fiber with a small amount of SiO glass molecules in the structure replaced by Er2O3 are the central elements of an EDFA The photons at 1480nm emitted from the laser excite electrons belonging to the erbium atoms The excited state called 11 2 actually a broad range of sub states and thermic variations in energy has a limited life span but if a photon at the appropriate wavelength energy comes close to this electron it will collapse down to the ground state 15 2 with a new photon emitted at the excact same phase and direction as the original photon If no photon passes by within the life span of the excited state the electron will collapse by itself and a photon will be generated at the wavelength matching the energy level in a random direction Some of these photons will have a direction along the signal path of the fiber and will therefore be amplified by other excited electrons at the same energy level This is called amplified spontaneous emission ASE and is the primary source of noise introduced in an EDFA 6 3 Operation modes An EDFA can normally be operated in one of three modes AGC A
5. Appendix A Materials declaration and recycling information A 1 Materials declaration For product sold into China after 1st March 2007 we comply with the Administrative Measure on the Control of Pollution by Electronic Information Products In the first stage of this legislation content of six hazardous materials has to be declared The table below shows the required information Toxic or hazardous substances and elements Ke Ei R ACHR RIA SR FR Part Name Lead Mercury Cadmium Hexavalent Polybrominated Polybrominated Pb Hg Cd Chromium biphenyls diphenyl ethers Cr VI PBB PBDE EDFA B C 17dBm O O O O O O O Indicates that this toxic or hazardous substance contained in all of the homogeneous materials for this part is below the limit requirement in SJ T11363 2006 X Indicates that this toxic or hazardous substance contained in at least one of the homogeneous materials used for this part is above the limit requirement in SJ T11363 2006 This is indicated by the product marking A 2 Recycling information Nevion provides assistance to customers and recyclers through our web site http www nevion com Please contact Nevion s Customer Support for assistance with recycling if this site does not show the information you require Where it is not possible to return the product to Nevion or its agents for recycling the following general information may be of assistance B
6. CC or APC The EDFA B C 17dBm has dip switch and GYDA settings for two of these AGC referred to in this document as Constant Gain and APC Constant Power In Constant Power mode the output power is regulated independently of input power In Constant Gain mode the output power varies with input power In addition there are two different versions of Constant Power For use with a relatively low number of SDI links which might transport a pathological signal there is a special SDI mode When using this mode the EDFA should not be used near saturation full output power Recommended output power in SDI optimised Constant Power mode is 14dBm There are two reasons for this First the regulation loop is slower in this mode therefore adding or subtracting optical channels from the fiber can lead to bit errors in other channels 1 Example values not for performance indications Specifically the EQ stressing 19 1 sequence that comes from displaying a uniform purple colour over several whole video lines nevion com 13 EDFA B C 17dBm Rev D if the overhead is insufficient Second an EDFA driven to saturation will not handle long streams of either 0 or 1 When the number of channels running on the fiber is high and the signals are uncorrelated the recommended operating mode is Telco optimised Constant Power In this mode the EDFA will have a very fast regulation loop that ensures error
7. efore attempting disassembly ensure the product is completely disconnected from power and signal connections All major parts are marked or labeled to show their material content Depending on the date of manufacture this product may contain lead in solder Some circuit boards may contain battery backed memory devices nevion com 17
8. ev D 5 Connections The backplane module EDFA C1 has 3 connectors GPI RX and TX and a lid covering the optical ports To connect or disconnect fiber patch cords to the optical ports the lid must be opened This is done by unscrewing the thumb screw and lifting the lid up Even though opening the lid automatically disables the EDFA we recommend always disabling the EDFA by turning the key before opening the lid The RX port is on the right TX on the left The third port to the left of the thumb screw is the GPI port with pinout as described in chapter 4 3 nevion com 12 EDFA B C 17dBm Rev D 6 Operation 6 1 Introduction The EDFA B C 17dBm will typically be used as a midway booster when there are many signals on the fiber or directly after the transmitter DWDM multiplexer if there are few signals The reason for this is that optimum input power on the EDFA for DWDM applications is 6dBm A full 40 channel system based on the flashlink DWDM 40C together with OdBm flashlink transmitters will already have approximately 14dBm at the output thereby requiring a 20dB attenuator to get 17dBm just 3dB up with a flat gain response out of the EDFA B C 17dBm On the other hand a narrow band DWDM system up to 8 channels will not experience problems with the gain frequency response of the EDFA B C 17dBm and can therefore directly benefit from the 17dBm output power compared to the app 7dBm from 8 channels in a DWDM
9. fety This unit is capable of emitting dangerous levels of light DO NOT UNDER ANY CIRCUMSTANCES LOOK AT THE OUTPUT OF THE UNIT OR FIBRE ATTACHED TO THE UNIT Containing a Class lllb assembly use the utmost case when changing connections and always turn the unit completely off before inspecting or cleaning any connectors which are attached to the unit s output 3 2 Fibre Cleaning It is imperative that the fibre ends of the EDFA are kept clean of dust and dirt to avoid insertion loss and back reflection Insertion loss will take away margin from the optical budget while back reflection will lead to excessive bias currents due to output power regulation being dependent on power measured at the output after isolator and gain flattening filter This also means that for output power testing the output should be properly terminated with minimal back reflection nevion com 6 EDFA B C 17dBm 4 Configuration 4 1 Dip switch settings The dip switches are also documented on the front of the EDFA Rev D The following dip switches change the meaning of the other dip switches 4 1 1 Common dip switches Pos Name Function OFF Function ON Comment 1 GP Constant Gain Constant Power Fundamental working mode for EDFA 7 AM Autonomous Manual RS232 Set OFF to use the RS232 port in the and or control front of the EDFA to control GYDA DIP parameters like function constant control power gain or dr
10. free operation on other channels when one or more channels are added subtracted from the fiber For this mode operation in saturation full output power is recommended For use as an inline amplifier not at transmit or receive locations constant gain mode can be beneficial In this mode all channels have roughly the same gain see gain flatness specification which makes margins gain and attenuation trivial to calculate for a system architect Optimal gain flatness is achieved with a gain of 23dB corresponding to 6 in 17dBm out For lower input power the output power will be correspondingly lowered from the definition of constant gain nevion com 14 EDFA B C 17dBm Rev D General environmental requirements for Nevion equipment 1 The equipment will meet the guaranteed performance specification under the following environmental conditions Operating room temperature range 0 C to 40 C Operating relative humidity range up to 90 non condensing 2 The equipment will operate without damage under the following environmental conditions Temperature range 0 C to 50 C Relative humidity range up to 90 non condensing nevion com 15 EDFA B C 17dBm Rev D Product Warranty The warranty terms and conditions for the product s covered by this manual follow the General Sales Conditions by Nevion which are available on the company web site www nevion com nevion com 16 EDFA B C 17dBm Rev D
11. ive 8 OVR Gyda control Dip switches When ON only dip switches can active change configuration GYDA can only monitor To control with GYDA set to OFF 4 1 2 Constant power mode In this mode dip switches 1 and 8 are set ON 7 is OFF Pos Name Function OFF Function ON Comment 2 ST SDI optimised Telco optimised Chooses between signal types present on the fiber For a low number of SDI signals which might display pathological signals shifts in average power set dip ON For many channels with fast adaptation to varying input levels set dip OFF 3 G3 Add 14dBm Add 10dBm These dip switches set the output 4 G3 Add 2dBm Add 0dBm power from a minimum of 10dBm to 5 G2 Add 1dBm Add 0dBm a maximum of 17 5dBm 0 5dB 6 G1 Add 0 5dBm Add 0dBm step 4 1 3 Constant gain mode In this mode dip switches 1 and 7 are set OFF while 8 is set ON Pos Name Function OFF Function ON Comment 2 ST Not used Not used No effect in Constant Gain mode 3 G3 Add 18dB Add 10dB These dip switches set the gain from 4 G2 Add AdB Add 0dB a minimum of 10dB to a maximum of 5 G1 Add 2dB Add 0dB 25dB 1dB step 6 GO Add 1dB Add 0dB nevion com 7 EDFA B C 17dBm Rev D 4 2 Status by LED s The status of the module can be easily monitored visually by the LEDs at the front of the module The LEDs are visible through the front panel as shown bel
12. nevion EDFA B C 17dBm SDI optimized Erbium Doped Fiber Amplifier User manual Rev D Nevion nevion com EDFA B C 17dBm Rev D Nevion Support Nevion Europe Nevion USA P O Box 1020 1600 Emerson Avenue 3204 Sandefjord Norway Oxnard CA 93033 USA Support phone 1 47 33 48 99 97 Toll free North America 866 515 0811 Support phone 2 47 90 60 99 99 Outside North America 1 805 247 8560 E mail support nevion com See http www nevion com support for service hours for customer support globally Revision history Current revision of this document is the uppermost in the table below Rev Repl Date Sign Change description D C 2015 10 22 OEH Added notice about fibre cleaning C B 2015 10 12 OEH Corrected dip switch settings B 0 2014 05 21 OEH Added LED chapter 0 A 2012 01 11 SHH Initial revision A z 2008 02 01 Initial revision not published nevion com 2 EDFA B C 17dBm Rev D Contents Revision history Eee otitis lied ici 2 Me Prod ct OV CNW AM ili ii lel eerie mise tach 4 2 POC CAUONG cer ias 5 2 Optical Characteristics esta alias 5 2 2 Power CONSUMPTION Gasca 5 2 3 Environmental conditions assis ids aa a a a na ae 5 CROIO ah Pen E EE E E E E E ee are OO ee re 6 A A A denke 6 AGONIU ON et tt tdt dal dias 7 2 1 DIR SWIECH SUIS dt een 7 Bell Common dip Switches 232 en o a A A E ORE 7 4 1 2 Constant power Mode en iaa an
13. ow Status TEMP LOS amp LOP LASER Figure 2 Panel indicator overview Text not printed on the front panel 4 2 1 LED status description The functions of the different LEDs are described in table below Diode state Red LED Yellow LED Green LED No light Status Module is faulty Module is OK Module has Module has power no power TEMP Laser Ambient Temperature is OK temperature temperature alarm alarm LOS amp LOP Loss of input Loss out output Signal is OK signal signal mute bypass LASER Laser fail Laser disabled Laser is OK mute bypass nevion com 8 EDFA B C 17dBm Rev D 4 3 GPI These outputs can be used for wiring up alarms for third party control systems The GPI outputs are open collector outputs sinking to ground when an alarm is triggered The GPI connector is shown in figure 7 There are two GPI inputs one for muting output power power goes to below safe limit and one for complete disable same function as key switch lid and software disable command Electrical Maximums for GPI outputs Max current 100mA Max voltage 30V EDFA B C 17dBm module GPI pinning Signal STATUS sd Pin 1_ Open Collector Output Output Loss of output Pin 3 Open Collector Output signal power Output ee bias current out of Eee 5 Open Collector Output eel off bias Sen to the active level laser below a 1 limits active level O volt pin Pin8 0V
14. uced output power mode that can be entered with the use of GPI GYDA or RS422 control EDFA can also be directly controlled over RS232 bypassing the Flashlink features The key lid GPI and GYDA RS422 still operate the shutdown and reduced output power modes even when using direct RS232 control EDFA status is monitored by use of LEDs GPIO and RS422 GYDA Erbium Doped Fibre Gain Flattening Tap Isolator Isolator Filter Tap Optical Optical ma OH gt gt H 7 a Input Monitor Output Monitor Photo diode Photo diode Microcontroller Remote Control Figure 1 EDFA block diagram nevion com 4 EDFA B C 17dBm 2 Specifications 2 1 Optical Characteristics Nominal input power 6dBm Maximum input power 4dBm Minimum input power 10dBm Total output power 17dBm 1 5dBm at Pin from 10dBm to OdBm Gain flatness Max 1 0dB at Pin 6dBm Pout 17dBm Max 5 0dB at Pin from 10dBm to 0dBm Noise figure Max 6 0dB at Pin 6dBm Pout 17dBm Wavelength range Full C band 1529 to 1562nm Number of DWDM ch Min 40 channels at 100GHz spacing Polarization dependant gain Max 0 5dB un Mode Max 0 5ps ispersion Input Output return loss Dune oft Min 35dB 2 2 Power consumption Maximum power lt 9W 5V consumption 2 3 Environmental conditions Operation temperature 0 45 C range Operation without damage temperature range 0C 55 C Rev D nevion com 5 EDFA B C 17dBm Rev D 3 Cautions 3 1 Laser Sa
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